Start of Spring is the 37th chapter of the Golden Kamuy manga.
Summary
Asirpa and Sugimoto find a body of a man who was brutally murdered and in parallel Ushiyama Tatsuma and Nagakura Shinpachi talks about that they found another and that their way of being killed corresponds to a serial killer named Kazuo Henmi, one of the Abashiri convicts. Ushiyama discovers Shiriashi and together with Hijikata Toshizou they retain him and force him to collaborate with them in exchange for leaving him alive. Shiraishi gets back to the village and discusses about the murders happening at fisheries with the others and they decide to go to the sea.